Exhaust-muffler.



J. BOYLE.

EXHAUST MUFFLER.

APPLICATION FILED AUG. 28, 1909.

Patented Dec. 14, 1909.

2 SHEETS-SHEET 1.

Nitnesses: Inventor.

6U. John 30916 a QM W J. BOYLE.

EXHAUST MUFFLER.

APPLICATION FILED AUG. 28, 1909.

PatentedDec.14,1909.

2 SHEETS-SHEET 2.

JOHN BOYLE, OF PEABODY, MASSACHUSETTS.

EXHAUST-MUFFLER.

Specification of Letters Patent.

Patented Dec. 14, 1909.

Application filed August 28, 1909. Serial No. 515,032.

To all whom it may concern:

Be it known that I, JOHN BOYLE, of Peabody, in the county of Essex and State of Massachusetts, have invented certain new anduseful Improvements in Exhaust-Mufflers, of which the following is a specification.

This invention relates to exhaust mufllers of the type employed for silencing the ex haust gases of internal combustion motors.

One of the objects of the invention is to provide a casing having an inlet and an out; let and a plurality of removable sections, each providing means for guiding the exhaust gas in a spiral course. The sections are arranged end to end and are separated by partitions which are formed to permit flow from one section to the next at a single point. The result of arranging the spiral sections successively is that the exhaust gas is conducted outwardly from the interim? of, one section and inwardly from the exterior of the next section, and so on accordingto the number of sections provided. The fiow passage for'the exhaust is unitary and is preferably arranged with its inlet and outlet in aliilernent with the axis of the casing in which the spiral sections are in closed.

Another (Ebject of the invention is to provide an out exhaust in intersecting paths so that one body of gas may strike and disseminate another. The exhaust nozzle herewith shown is constructed to produce a conical sheet of exhaust gas and a pluralit of relatively small jets directed outward y at a greater angle than that of the conical sheet, said jets being adapted to cross each other and intersect the conical sheet.

be increased or diminished.

Referring to the drawings, which illustrate one form in which the invention may be embodied,F-i 'ure 1 represents a longitudinal section of anexhaust muflier provided with two spiral sections. Fig. 2 represents a cross section on line 2-2 of Fig. 1. Fig. 3 represents a longitudinal section, on a larger scale, of the outlet nozzle. Fig. t represents a cross section of the nozzle on line 44 of Fig. 1. Fig. 5 represents a 'lonitudinal section of another form of muifier ml which the spiral guide has the formof a he ix.

et nozzle adapted to direct the- I The nozzle may be adjusted with relation to the outlet so that the area for forming the conical sheet may,

The same reference characters indicate the same parts wherever they occur.

On the drawings the niuflier is represented as comprising a casing 10 which is preferably cylindrical in form.

11 indicates an inlet pipe, and 12 indicates an outlet, said inlet and outlet being preferably at opposite ends of the casing in alinement with the axis thereof. The casing may be provided with a water jacket 13 and means for connecting pipes 14 of a water-circulating system by which the mutller may be cooled. The casing may be formed of two sections, as illustrated, which may be connected in any preferred manner, such as by flanges 15 drawn together by bolts 16 and provided with packing 17.

In the interior of the casing are arranged a plurality of spiral sections each comprising a relatively broad sheet-metal strip 18 bent inthe form of a spiral, and a pair of relatively narrowstrips 19 for s acing the convolutions of the strip 18 and or closing the ends of the convolutions. The'sections are arranged end to end, and a partition,

such as a plate. 20, is interposed between the abutting ends of two sections. The exhaust gas entering the casing through the pipe 11 enters the interior of the first spiral section and is prevented from immediately entering the second section by the intervening partition 20. It therefore flows outwardly from the center of the casing toward the periphcry in a spiral course between the convolutions of the strip 18, and upon reaching the end of said strip it may pass to the exterior of the succeeding spiral section, assing around the outer edge of the partition 20, which is sufficiently cut away for this purpose. The gas is then conducted in the reverse direction through the second section, namely, from the exterior to. the interior. There are two of such spiral sections illustrated on the drawings, but the number may be increased if desired. The gas upon reach-g ing'the interior of the last section may pass into the outlet 12, from which it is conducted to the atmosphere by a spraying nozzle, illustrated in detail by Figs. 3 and 4.

' The nozzle indicated at 21 is formed with a conical wall 22 and a plurality of radial ribs 23. The smaller end of the cone is inserted .in the outlet and is held centrally therein by the ribs 23. The nozzle is provided with means for clamping it in any desired position in the outlet, said means in eluding an expanding bolt 24 and nut 25. The nozzle is slotted at 26 in order to permit expansion when the bolt 24: is drawn up to enable the ribs to firmly engage the interior of the outlet 12. The'exhaust gas passing between the mouth of the outlet and the conical Wall 22 takes the form of a conical sheet, indicated by lines a in Fig. 3. The wall 22 is formed with a plurality of apertures 27 through which a portion of the exhaust gas is directed in cross currents along lines I) b which intersect the continuous sheet of gas. In this way the greater portion of the exhaust gas is broken up by the jets flowing from the apertures 27 and the noise of the escaping gas is kept at the minimum degree. The nozzle may be adjusted longitudinally in the outlet so as to increase or diminishthevolume of the continuoussheet of exhaust gas.

In the form shown by Fig. 5, the gas entering' the mufiler casing 10 at the inlet 11 engagesa spiral deflector 30 of helical form whose continuous edge fits closely against the interior of the wallof the casing. The two endsof the deflector are curved as indicated at 31 and 32, for the purpose of gently changing the direction of the gas. or the same reason the central portion of the partition 20 in the form shown by Fig. 1 may be formed with a nose or projection 20 which is adapted to deflect the gas from ,a longitudinal course to a transverse course.

It will be noted that in both forms herewith included, the gas is conducted through a tortuous course, and that the course is marked by the absence of abutments extending transversely to the direction of the flow. The gas therefore does not impinge squarely against any obstacles, but is guided from the inlet to the outlet by devices against which it strikes with glancing effect.

I claim 1. An exhaust mufiler comprising a cylindrical casing having an inlet at one end, and an outlet at the other end,'a series of flat strips of spiral form arranged edge to edge in said casing, said strips substantially filling the casing but being so curved as to provide spaces between their respective convolutions, and members engaging the adj acent edges of the spiral strips and constitutin partitions closing the sides of the convo ute spaces between said strips, said partition members, however, being cut away or omitted at such points as to leave a continuous unitary passage from said inlet to said outlet.

2. An exhaust mufiler comprising a cylindrical casing having an inlet at one end and an outlet at the other end, and interengaged members so correlated with the interior of the casing as to form a closed unitary passage extending from said inlet to said outlet, said passage including a series of convolute portions and each portion in-v cluding a series of convolutions.

3. An exhaust mutller colnprlsmg a casing having an inlet, an outlet, and means at the outlet for forming a continuous sheet of a portion of the exhaust, and for forming jets intersecting the continuous sheet.

In testimony whereof I have aflixed my signature, in presence of two witnesses.

JOHN BOYLE. Witnesses: Y WV. P. ABELL,

ARTHUR H. BROWN. 

